Eccentric connection



June 23, 1925. 1,542,855

- J. E. CHALMAN ECCENTRIC CONNECTION Filed April 23. 1921 Patented June 23, 1925.

, 1,542,855 PATENT omen.

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I orIALMAn, or em' xqaiitmcls; 1 assrenon r 1 UNION SPECIAL MACHINE COMPANHY, or c IcAeo, ILLINOIS, ACORPOB-ATION oi 'lnL nols.

ECCENTRIC cornwno'rioiv. f:

hipiilication-filedhpril23, 1921. Serial-K014164943; 1

Tool} whom c 't mary concern: I Be it known that LJOHN E. CHAnMAN, acitizen of the United States, residing at tions generally, 'and 'm'ore particularlyto means for oiling the eccentric which drives the needle lever of a sewing machine.

' Atthe present time, the bearing surface between the eccentric and its strapis oiled by means of aqwi'ck'or wiper spongearranged in a bore in'the top'ofthe strap and the oil is generally fed to the sponge through a bore inthe needle lever, which bore regis ters with the bore in the strap. 1 As a rule, the st-ra-p isalso provided wit-h an additional 1 bore at the side for the'reception of a second wiper spongebearing on the wearing surfaces. The disadvantage of theseprior conf I structions lies in the fact that when the eecentric is first oiled, on starting, it-takes considerabletime for the oil to absorb through the wiper sponge and reach the eccentric surface. Furthermore, if'the machine is left standing for any time, the'supply of oil in the sponge drys up or the oil works backthrough the .sponge and away from the bearing surface. So also theadditional bore in the side of the strap weakens the strap and unbalances it. I The main object of the present invention is to provide a device which will not only oil the eccentric surface immediately on starting but will also maintain a supply of oil for the bearing at all times.

Another object of this invention is to eliminate the drying up of the oil in the bearing by providing a reservoir or pool of oillocated at the lowermost bearing surface of the eccentric so that the excess oil on the bearing will flow downwardly into the reservoir and assist in maintaining the pool for splashing the bearing.

Another object of this invention is to provide the eccentric strap with an internal reservoir communicating with the eccentric face at a point immediately beneath the eccentric and communicating with an inlet or inletson the exterior face of the strap,

Chicago, inthe county of Cook, State of which inlets are located substantially above the lowermost plane of the reservoir so that when oil is introduced into the reservoir through theseinlets, it will blow to a point immediately beneath the eccentric to form at-this point, a gravity-fed pool of oil for splashing the bearing.,,

Thesezand other objects will in part'be obvious and will in part behereinaftermore fully disclosed. y 1 1 panying drawings 1 1 1 Referring more particularly to the accom- 1 Figure 1 is a side elevation of the oiling device showing one ofthe oil inlets exterior face of the strap, 1 d 1 v FigpQ is a sectional view thereof on the line 22 of Fig. l;- 1 A Figs. 3 and-4 are detail views of the strap sections, and I 1 1. 1 1 1 .1 Fig. 5is an enlarged sectionalviewof the lower oiling'strap showingthe oil valve in section; v s

In general, the device includes the usual eccentric mounted on the main driving shaft on, the

eccentric strap for drivingthe needle lever. The lower sectionof the strap isbored, the boreinclining inwardly and downwardly front opposite points on the exterior face of the strap, to a point'located immediately under the central portion of the eccentric.

At this point, the upper wall of this strap is apertured so that the intermediate portion of the bore communicates with the eccentric surface. Each endof the bore communicating with the exterior of the strap isprovided with a valve for the introduction of the oil and for retaining the oil in the bore.

Referring more particularly to the accompanying drawings, the base of the machine 1 is provided with the usual main drive shaft 2 upon which is mounted the pulley 3 and adjacent eccentric 4: surrounded by the eccentric strap comprising the upper strap section5 and the lower strap section 6, the upper strap section being bored as at 7 at the top, to receive the threaded end 8 of the needle lever connection rod 9 held in place by means of the nut 10. The wiper sponge or wick 11 is mounted in the bore 7 of the strap so as to bear on the periphery of the eccentric. 1 i

As in prior constructions, the upper and lower strap sections are held in assembled position by means of screws 12 and 13 of themachine surrounded by a two-piece threading into bores in lateral flanges 1,4 and 15 on the sections. i f My improved means for oiling the eccentric resides in forming the lower strap sec tion with an oil reservoir located immediately beneath theeccentric. In the form illustrated, this reservoir is formed by providing the strap section 6 with two bores or recesses 16 and 17 which extendinwardly introduction of'oil into the reservoir, Preferably they are closed by spring seated retainingvalves 21 and 22. a V V V a. A simple form of valve comprises ashelllike cylinder 23 provided'with an aperture inits outer end, which aperture is'closed by a semi-spherical valve 2 1 having oppositely disposed fingers 25 for retaining a spring 26 in place between the valve 24 and the end of the shell-like cylinder 23. It is evident-- that any. type of oil retaining valve may be used. It is furthermore evident that While one valve will sufiice for this purpose, by the arrangement of the-two valves on the opposite faces of the strap, oilmay be introducedfrom one orv the other side of the strap, depending upon the type of machine used. In'order to'provide a communication between the reservoir and thebearing surface of theeccentric, the upperwall of the lower strap section 6 is apertured as at 27 by which arrangement ,oil in the resertvoir can easilysplash upon or. reach the bearing surface of the eccentric from which point it will be carried aroundito the'wiper sponge 11, which wipes clean the bearing Surface, retainingand absorbing some of the grit from going back into the oilreservoir.

the oil in they sponge. This sponge not only keeps the surface clean, but also prevents vIt isobvious that by inclining the bores" 16 and 17 downwardly, the oil when initially. inserted througheither or both valves, will gravitate to thecenter of thereservoir,for in other words, to a point; directly under the lowest portion of theeccentrica, When the machine is'at rest, the oilwhich' has been previously picked up by the eccentricwill also gravitate'into the central: portion of the'reservoir. 4

Itisobvious that minor changes inthede tails of construction and in the arrangement of parts may be made without departing'from the spiritofthe inventionasset forth inthe appended claim.

Having thus described tl16l11V6I1tlOl1,Wl13,t

I claim as'n-ew and desire tosecure by LettersvPatent, is 5 ,In a device of the cIass described, the combination. with .a driving shaft provided with an eccentric; of a strap surrounding said eccentric, said strap being form-ediwith an; internal recess inits lowermost-portion immediately beneath said eccentric and communicating with said-eccentric, saidv recess extending from said central portion of the strap immediately beneath said eccentric upwardly and outwardly on each side thereof to the opposite exterior faces of said strap, and oil retaining valves respectivelygarranged in the opposite endsof said bore. I

ture;

i JOHN it. on Ali MAN a Intestimony whereof, I aflixmy signa-' 

